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A mysterious sound emerged from underground has given residents sleepless nights and left them terrified for weeks.
The eerie noises, which were first discovered by residents in the Greek neighbourhood of Meteora in west Thessaloniki, started roughly five weeks ago in early December.
Locals complained that they could hear the deafening sound every day from midnight to early hours and curious urban explorers are now visiting the site to locate the source.
In a video posted by a member of the Residents Union of Meteora, he heads out to the junction of Kifissias and Acropolis streets where he hears a continuous, paced rhythm of loud thumps.
The sound gets louder when he places the camera closer to the ground.
Some viewers speculated if someone had been secretly digging underground tunnels at night and others compared it to something out of a movie scene.
"Are they still playing Jumanji these days?" one asked while a second joked: "The nephilims are out with the Hobbits."
The Residents Union said in a Facebook post that they have reached out to the local authorities and asked for an investigation.
A spokesperson for water company EYATH told the Residents Union representatives that they found no relation to the water pipes in their initial investigation.
"They gave their personal opinion saying that the sound might be coming from the side of the Seih Su Forest and might be echoing in our area," the post read.
Kostas Papazachos, professor of Geophysics of the Aristotle University of Thessaloniki, analysed the audio clip and ruled out the possibility of being due to a geological phenomenon.
He told national broadcaster ERT: "If you listen to this noise as I heard it and on various websites it is recorded, it is a periodic noise of a beat.
"Earthquakes don't show this pattern as they happen suddenly.
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"It's obviously man-made in origin, it's a pump, a fuse, a water switch. It is a periodic noise and in no way has a geological origin."
Worried residents recently reported that they could feel the ground moving along with the noises and some were forced to move out of their house.
The streets have become a tourist attraction for urban explorers as they flocked to the area and stayed for hours to hear the sounds and searched for the origin.
The latest inspection indicates a possible link to the water pipes but the investigation is still ongoing.
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